Rename pdf/draw_utils.* to pdf/draw_utils/shadow.*.

Currently, pdf/draw_utils.* only contains code to draw shadows. Move
this code into pdf/draw_utils/, so there is a directory for more drawing
utility code in upcoming CLs.

Change-Id: I869835ee82fca67622623b92c26e6af23b234741
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1696441Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676454}

pdf/BUILD.gn

@@ -53,8 +53,8 @@ if (enable_pdf) {
       "document_loader.h",
       "document_loader_impl.cc",
       "document_loader_impl.h",
-      "draw_utils.cc",
-      "draw_utils.h",
+      "draw_utils/shadow.cc",
+      "draw_utils/shadow.h",
       "out_of_process_instance.cc",
       "out_of_process_instance.h",
       "paint_aggregator.cc",

pdf/draw_utils.cc → pdf/draw_utils/shadow.cc

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "pdf/draw_utils.h"
+#include "pdf/draw_utils/shadow.h"
 
 #include <math.h>
 #include <stddef.h>

pdf/draw_utils.h → pdf/draw_utils/shadow.h

@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef PDF_DRAW_UTILS_H_
-#define PDF_DRAW_UTILS_H_
+#ifndef PDF_DRAW_UTILS_SHADOW_H_
+#define PDF_DRAW_UTILS_SHADOW_H_
 
 #include <stdint.h>
 
@@ -54,4 +54,4 @@ void DrawShadow(pp::ImageData* image,
 
 }  // namespace chrome_pdf
 
-#endif  // PDF_DRAW_UTILS_H_
+#endif  // PDF_DRAW_UTILS_SHADOW_H_

pdf/pdfium/pdfium_engine.cc

@@ -29,7 +29,7 @@
 #include "gin/public/gin_embedders.h"
 #include "gin/public/isolate_holder.h"
 #include "pdf/document_loader_impl.h"
-#include "pdf/draw_utils.h"
+#include "pdf/draw_utils/shadow.h"
 #include "pdf/pdf_transform.h"
 #include "pdf/pdfium/pdfium_api_string_buffer_adapter.h"
 #include "pdf/pdfium/pdfium_document.h"